Guide to filtering web content (http and https) with pfsense 2.3



  • I am not sure on this, if you use the transparent proxy then that only listens on port 80 and 443 for MITM.



  • Finally I found out the solution… (http and https)
    https://forum.pfsense.org/index.php?topic=96782.0



  • I am trying to block facebook and youtube and some unwanted sites using Squid and SquidGuard filtering but those sites are't blocked. I can still access the blocked sites. Please can any one help me where i went wrong?



  • This post is deleted!


  • @aGeekhere
    First thank you for the detail guide. I'm running netgate 2.4.3_1 connected to TorguardVPN service and have had http transparent proxy (squid) running fine for some time. I've recently decided to add https filtering with squid/squidguard on netgate and WPAD on a separate http server. I can access the wpad files just fine using both the wpad.localdomain address or ip address. But the SSL filtering doesn't seem to work.
    It seems on my system, transparent proxy only works on http sites. In order to get to https/ssl sites I have to explicitly setup my proxy address and port in windows.

    Any help or hint is appreciated



  • @stuck In squid SSL - Man In the Middle Filtering - HTTPS/SSL Interception tic Enable SSL filtering and SSL/MITM Mode set to splice all



  • Thank you for this guide aGeekHere!

    Would you be able provide instructions on how to exclude websites from being proxied please? I have transparent proxy setup, no WPAD, SSL/MITM mode set to Splice All. Filtering web content is working great except that Microsoft Office 365 applications seem to be having connectivity issues. When user traffic is no longer being proxied, issue is resolved. Would like to exclude all Office 365 related domains/sites from the proxy.

    Thank you again for any help or advice in advance.



  • You need to set up the WPAD for windows updates and office for connections to work.

    This is how it works
    The WPAD directs traffic to port 80 and 443 if the programs supports it (a lot of programs do not).
    Transparent proxy catches any traffic going to port 80 which is not supported by the WPAD.
    SSL/MITM Mode set to splice all catches any traffic going to port 443 which is not supported by the WPAD, However this may not always work with things like windows updates and word, this is meant to be like a safety net that catches any missed connections from the WPAD.

    So you need all 3.



  • Is it still possible to create exceptions to not proxy trusted sites with transparent proxy?
    There are some specific sites that will need to bypass the proxy for some of our application to function. WPAD was used initially in our environment but some traveling users had issues with persistent proxy settings so would prefer to only use the transparent method.



  • @zonda
    Sure, the option is under ACLs in squid. If users do not want to use the WPAD (auto config proxy) then they should manually enter in the proxy settings in internet options (if using windows). Do not rely on SSL/MITM Mode splice all for all 443 traffic or else you will get connection errors. That is if you are blocking port 80 and 443 and forcing users to use the proxy.



  • Hello. I use your guide http and https to filter traffic but i have problems with youtube videos

    Restricts many videos in an erroneous way

    Do you know how i can solve it?



  • @jopeme2000
    "NOTE: Safe search for youtube is not as advanced as google safe search, which results in a lot of safe content be filtered out."

    Google has to improve it, nothing you can do about it



  • @aGeekhere
    Hi,
    A great thank you for this guide. It is the most complete guide for traffic filtering on pfSense I was able to find.
    I made traffic filtering work for a customer who wants porn filtering and it works. But doesn't work perfect. It works great on desktop machines while on Android phones it blocks more than required. For example: it also blocks all Skype and Facebook Messenger traffic and also blocks my RSS feed reader to connect to Internet on Android phones.
    Can you explain a bit what you thought with this in june 2016 edit:
    "I have found that if you have connection issues using auto config for android or other smart phones try manually setting the proxy, now opening port 80 and 443 is not needed."
    Thank you.



  • @roberz
    For android phones (depending on with android version) auto config has issues so you have to manually enter in the proxy settings.

    If things like Skype and Facebook Messenger are being blocked make sure you also have set up transparent proxy with splice all for SSL Man In the Middle Filtering.

    The idea is
    First use the WPAD to connect to the proxy (if the device has auto config issues you have to manually add it). If a program does not have proxy settings the transparent proxy and SSL Man In the Middle should catch the rest. The reason why to first use the WPAD is that some programs/software (like windows updates) have connection issues with transparent proxy and SSL Man In the Middle, splice all.

    So first use the WPAD as a shortcut so you do not have to configure all devices on your network to use your proxy.
    Then for devices that have auto conf issues manually config them.
    Finally have the transparent proxy and SSL Man In the Middle splice all to catch any traffic that cannot use the proxy .

    Hope this was helpful



  • f3ae6cac-c635-4451-9111-21aa2f13f337-image.png

    Hi sir, all step are follow, search engine n safe search is working, but some of the images in whitelist website can't load.



  • Just tested and it loads fine for me. Check your blocklist in your web filter (e.g squidguard).



  • the problem is default acl. when i try do deny all, the whitelist website can't load some images, when i try to allow default acl the whitelist website, can load images but the browsing of the whitelist are very slow.



  • i'll try the whitelist website can only access and the other can block.



  • hi sir, how about gmail, how to allow gmail in whitelist, i tried add gmail.com in whitelist but still block the access.



  • In squidguard set Default access [all] to allow. Now only block the categories you want. You can use shallalist for categories.



  • dns resolver doesn't start when i include the forcegoogle.conf in the custom options.

    if i remove it, it works just fine.



  • did you make the forecegoogle.conf file?



  • @aGeekhere problem was, i followed the initial instructions by putting the youtube and bing into the host overrides, then copied the whole forcegoogle section without checking the contents.

    In has youtube with a different address and bing. Removed those and it works.


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